Use the OpenSwiftUI ABI namespace for OpenSwiftUICore

[Kyle-Ye]

Summary

• Configure OpenSwiftUICore to emit symbols under the OpenSwiftUI ABI namespace in SwiftPM and Tuist builds.
• Remove declarations duplicated between OpenSwiftUI and OpenSwiftUICore so both frameworks can safely share that namespace.
• Update protocol descriptor and interposition helpers to reference the shared symbol names, including the DefaultStyleModifier descriptor.

Motivation

OpenSwiftUI and OpenSwiftUICore are distributed together as one API surface. Binary consumers, including Xcode previews, need core symbols to resolve through the same OpenSwiftUI namespace exposed by the public module.

The core target previously emitted OpenSwiftUICore-prefixed symbols while binary consumers resolved them through OpenSwiftUI. Aligning the ABI name keeps source and binary distributions consistent and prevents preview loading failures caused by the mismatched symbol namespace.

Validation

• Validated targeted hosting, observation, and image-orientation coverage with the AttributeGraph backend.
• Verified the rebased diff has no whitespace errors.

[augmentcode]

🤖 Augment PR Summary

Summary: Align OpenSwiftUICore’s emitted symbols with the OpenSwiftUI ABI namespace so binary consumers resolve core symbols consistently (e.g., Xcode Previews).

Changes:

• Add -module-abi-name OpenSwiftUI for OpenSwiftUICore in SwiftPM and Tuist/Xcode builds.
• Remove duplicate declarations from OpenSwiftUI that would collide once both targets share the same ABI namespace.
• Update C protocol-descriptor and interposition helpers to reference the shared OpenSwiftUI-mangled symbol names (including DefaultStyleModifier).

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 26.79%. Comparing base (617f96f) to head (77f0d70).

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #960       +/-   ##
===========================================
+ Coverage   14.57%   26.79%   +12.21%     
===========================================
  Files         689      730       +41     
  Lines       46143    52761     +6618     
===========================================
+ Hits         6725    14135     +7410     
+ Misses      39418    38626      -792     

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